Industrial oven



Nov. 20 1923.

w. c. EHMKA INDUSTRIAL ovm Fileq June 14 1920 4 Sheets-Sheet 1 WITNESSES} INVENTCR.

WA TTORNEY.

w. c. EHMKA INDUSTRIAL OVE'N Nqv. 20 1923.

Filed June 14 1920 4 Sheets-Sheet 2 J INVENTOR. DXLQLW C M WITNESSES: 3:

. M Hz. 4

Nov'. 20 1923. 1,474,515

w. c. EHMKA' INDUSTRIAL OVEN Filed June 14 1920 4 Sheets-Sheet 5 I I I l! 4... .I -21 WITNESSES. a

FM. 6 u 6, 82min.-

Nov. 20 1923.

w. c. EHMKA INDUSTRIAL OVEN 4 She its-Sheet 4 Filed June 14 1920 IN V EN TOR.

WITNESSES:

Patented Nov. 20, 1923.

7 mists winner: 0. EHMKA, or Darnell, ivironienn, ess enon 'ro nn'rieoirs innr METAL, I

WORKS, or DETROIT, MICHIGAN, A. PARTNERSHIP FIRM.

. INDUSTRIAL OVEN.

Application filed June 14,

Kitchener Ave), have invented certain new and useful Improvements in an Industrial Oven, and declare the following-to be a lull, clear, and exact description of the 10 same, such as will enable'others skilled in theart towhich it pertains to make and use the same, reference being had to the accompanying drawings, which form a part of these specifications.

Theobjectsof my invention are to secure an industrial oven of portable construction, and provide means for the heat expansion of the walls which will preven buckling of the wall plates.

Another object is to provide a heat insulated jjoint whereby no' single piece of metal extends through the wall, and there by reduce the loss ofheat .due to conduction of the. metal, and. its surface radiation.

It is still further objectof the invention to "secure simplicity in construction and efiiciency and ease in operation of the oven.

These several objects are secured in their preferred form by the construction and arrangements of parts as are more fully herein'after described.

Similar parts on all drawings are marked by similar numerals. V

Fig. l is a top view of the oven, showing in plan the ventilating system, and the general construction of the oven unit.

Fig. 2 is a front viewv of the oven show ing the entrance door'and air circulating system.

Fig. 3 is a side view of the oven, also showing the circulating system and the air 'Cl121-IIlb6I'S. Fig. 4 is a rear' circulating system. H

-Fig. 5 is a sectional view '-AA'-. as is shown on Fig. 1, showing the general construction of the oven walls and the interior circulation. 7

Fig. 6 is a sectional view BB- as is shown on Fig. 1, showing the special roof construction and the baffle plates in the circulating system. I

Fig; 7 is a sectional view CC as is viewof the oven and 1920'. SerialNo'. 388,974.

shown on Fig. 2', showing'the panel construction of the walls.

Fig. 8 shows the panel joint in the' wall construct-ion for the insulation and heat expansion.)

Fig. 9 shows the panel joint of the roof construction and provisions for the heat expansion.

Fig. 10 shows the door-constructiom with insulation.

I will now describe more fully the detail;

construction and the working parts thereof,

referring to the accompanying drawings and the marks thereon.

The general construction of the oven walls 1 consists of portable rectangular'panels which are fastenedtogether in erectingthe oven.

The floor isconstructed of-a suitable heat insulating material and placed on theoven foundation. Mounted on the floor slab are thewall panels 2, comprised of a sheet metal jacket riveted together to form a hollow rectangular panel, and filled with a heat retaining material. These slabs are securely fastenegltogether at the edges by-ineans of lap joints andscreWs as. shown in Fig. 8'.

The joint also providesa'spacebetween the Y edges of thepanels which is to be filled with loose heat retaining material thus-giving the panel room to expand. The panels are'held in place by means of angle irons 3"and 4, se-

curely fastenedftothe edge of thefloor slab by anchors 50 and allowing the wall panels to slide freelytherein, The'wall corners 7 and 8 are separate units but of similar construction to the wall panels, and-arejoined to the wallpanels as is shown in Fig; '8. 5

Along the top edge of each of the'side walls is fastenedan angle iron 5 bymea ns of anchors 51;; Between the T-bansupports are placed the roof slabs 19, which are of similar construction to the wall panels, but hereinafteiimore fully described, and-- comprised of sheet metal rivetedtogetherfto form hollow rectangular panel which is filled with a heat insulating material.

left between theedges of roof panels whic i is .filled with the loose heat insulating niate rial, and is held in place by thecover plate an {openin is 16, by means of screws,iand slotted .holes to.

allow for expansion.

loose insulating material in the corner; and- Thedroof panels extend slightly beyond the inner edge of the; wall panels to form a seal for retaining the securely fastened to the corner units 8, thus giving free access to'the'ovenfor' placing or removing materials: for drying.

The panel construction is shown in detail in Fig. 7 and F ig.- 8. It is the intention of the inventor to make these panels of a uniform construction so that a standard panel maybe usedfor the entire wall. The panels are to be placed in alternate position as is shown in Fig; 7 thus giving uniformity to the wall,'yet ina1ntai1 11ng a solld and rigld unit construction.

be varied by chang the numbefoflvau panels in the construction thereof. Fig. 8

' shows in detail the wall panel joint. The

side Walls 13 are sheet metal ofsuitab'le gage and are connected by an edge plate 14; bent 7 H 'haust chamber 26is located in.:the rooflof in a zig-zag to receive the sheet of asbestos 1 5, or. any other heat insulating material,

which is placed between the side wallsand the edge plate so there is no steel to steel contact, and the heat loss by conduction is brought to a miniumum, as no steel part extends through the wall. The wall slabsior.

panels when placed together provide a complete insulated joint of non-conducting heat material, and are joined together by means of lap-joints and. screws, and forming a hollow joint which is filled with a loose heat insulating materialto allow for the expansion of. the panels due to the oven heat.

1 The detail, of the roof joint is shown in Fig. 9. The side walls 17 are sheet'metal of suitable gage, and are connected by the edge 7 width.

through the conduction of the metal.

edges of the panels rest ontheT-bar sup ports and are held in place by the cover plates16. which are. fastenedto the edges. The joint between the edge of the roof panels is filled with'a loose heat insulating material toallow the free movement thereof when expanding, and to give the roof the'effect of a solid and continuous insulated slab. The wall can be made of any desired thick ness for retaining heat to any degree. 1 Likewise the'pane'ls may be made of any desired The door construction is to be similiar to that shown' in Fig. 10, making as nearly an air tight joint as possible. plates are also connected with. a ziz-zag plate 20, and insulated tlierefrom by the asbestos sheet21 placed to prevent any steel to steel connection, thus reducing the loss of heat due to conduction and radiation to a minimum.

Thesize of the oven-may The side wall' The oven may be used as a single unit, or

in a series of ovens placed side by side and using acommon wall between, s l 7 Inside the oven, and-supported by :the

wall-s, are .the heat units42, so placed as to circulating fan as itenters the oven through the portals 34c and by'meansflof the baffle plate 35. 'The heat unit may be of any 'de! sired type. i

The double fans areiplace-don a common shaft and supported by the main pedestal 25, and operated by the drive belt 24. Fan 23 is the circulating fan drawing its "supply of air for the oven from thefexhaust 7 1 i' come in contact with allthe air from the In connection with theoven is afventilating system comprised of theolouble fans 22 and 23.. These fans may be located; at the top of the oven or atany convenient loca-."- tion..

chamber 26 and'thebreatherQT The extheoven andreceives the, light heatedair' therein and is mixed with thefresh air fromf j the breather 27 in such proportions as may damper 29 placed in the circulating pipe 30. The supply fan 23exhausts. the air into the circulating pipes 31 and 3 2, and into the lower plenum chambers 33 and thence dis- 'tributed through the portals 34 into the Inside the oven and op ositexfthe ion, the air in an'upward direction and 'passing oven. portals 34 are bafileplates 35 w i'chstart through the heating units diffuse-s through J the entire oven. The heavy gases and fumes from the baking material settle-to the botl tom of the oven and are drawn off through theportals 36 into the exhaust chamber. 37. i

Chamber 37 is exhaustedby means of-the exhaust fan 22, drawing the'air through the i pipes 38' and 39,. and exhausting [same through the outlet 40 into a chimne'y; The

amount of air drawn from. the exhaust chamber- 37 may be regulated by means ofv the dampers 41 placed in theiexhaust pipes 7 I j 38 and 39. i a

1 In-describing the above inventionpI desire alent to those herein described.

claim as my invention and desire to. secure by LettersPatent is: w i

it to be understood-that the same is merely illustrative of the oven now in use, and'IQdof not wish to be confined to the-Ipreoise con-. struction and arrangement of parts: asl shown. The above description is to include any substitute construction and arrange; .ments of parts which arejobviously equiv .1. A portable oven, withvwalls comprising a combination of detachable heat insulated panels, means for supporting same,"means for connecting same by a heat insulated joint, heat insulated ceiling slab and means for connecting same by heat insulated joints.

2. Inan oven, with both Walls and ceiling comprising a con'ibination of V detachable heat insulated panels, means for supporting same, means for oining said panels together by heat insulated joints, means forjoining the ceiling and Wall panels, a heat insulated floor, and means for connecting the Wall panels thereto and meansfor Wall expansion thereon.

3. An oven, With Walls, ceiling and floor comprising a combination of detachable heat insulated panels means forlsupport ing same and means for joining said panels together with heat insulated' oints.

l. In an oven, With Walls and ceiling comedge plate connecting the side Walls, means for insulating said edge plate from theside: Walls, means for joining the panels together, means i for insulating the joint. between panels.

In testimony whereof, 1, WILLIAM C. EHMKA," sign these specifications WILLIAM vC. EHMKA.

Witnesses: a

HARRY QUIGLEY,

L. S. FISHER. 

